9ff05123e3
This adds the segment constructor (also called log writer). The segment constructor collects dirty buffers for every dirty inode, makes summaries of the buffers, assigns disk block addresses to the buffers, and then submits BIOs for the buffers. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
182 lines
4.6 KiB
C
182 lines
4.6 KiB
C
/*
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* file.c - NILFS regular file handling primitives including fsync().
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Amagai Yoshiji <amagai@osrg.net>,
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* Ryusuke Konishi <ryusuke@osrg.net>
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/writeback.h>
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#include "nilfs.h"
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#include "segment.h"
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int nilfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
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{
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/*
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* Called from fsync() system call
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* This is the only entry point that can catch write and synch
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* timing for both data blocks and intermediate blocks.
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*
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* This function should be implemented when the writeback function
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* will be implemented.
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*/
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struct inode *inode = dentry->d_inode;
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int err;
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if (!nilfs_inode_dirty(inode))
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return 0;
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if (datasync)
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err = nilfs_construct_dsync_segment(inode->i_sb, inode);
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else
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err = nilfs_construct_segment(inode->i_sb);
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return err;
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}
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static ssize_t
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nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_dentry->d_inode;
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ssize_t ret;
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ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
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if (ret <= 0)
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return ret;
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if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
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int err;
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err = nilfs_construct_dsync_segment(inode->i_sb, inode);
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if (unlikely(err))
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return err;
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}
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return ret;
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}
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static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct page *page = vmf->page;
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struct inode *inode = vma->vm_file->f_dentry->d_inode;
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struct nilfs_transaction_info ti;
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int ret;
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if (unlikely(nilfs_near_disk_full(NILFS_SB(inode->i_sb)->s_nilfs)))
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return VM_FAULT_SIGBUS; /* -ENOSPC */
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lock_page(page);
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if (page->mapping != inode->i_mapping ||
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page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
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unlock_page(page);
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return VM_FAULT_NOPAGE; /* make the VM retry the fault */
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}
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/*
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* check to see if the page is mapped already (no holes)
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*/
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if (PageMappedToDisk(page)) {
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unlock_page(page);
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goto mapped;
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}
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if (page_has_buffers(page)) {
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struct buffer_head *bh, *head;
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int fully_mapped = 1;
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bh = head = page_buffers(page);
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do {
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if (!buffer_mapped(bh)) {
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fully_mapped = 0;
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break;
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}
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} while (bh = bh->b_this_page, bh != head);
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if (fully_mapped) {
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SetPageMappedToDisk(page);
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unlock_page(page);
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goto mapped;
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}
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}
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unlock_page(page);
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/*
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* fill hole blocks
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*/
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ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
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/* never returns -ENOMEM, but may return -ENOSPC */
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if (unlikely(ret))
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return VM_FAULT_SIGBUS;
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ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
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if (unlikely(ret)) {
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nilfs_transaction_abort(inode->i_sb);
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return ret;
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}
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nilfs_transaction_commit(inode->i_sb);
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mapped:
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SetPageChecked(page);
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wait_on_page_writeback(page);
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return 0;
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}
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struct vm_operations_struct nilfs_file_vm_ops = {
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.fault = filemap_fault,
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.page_mkwrite = nilfs_page_mkwrite,
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};
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static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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file_accessed(file);
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vma->vm_ops = &nilfs_file_vm_ops;
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vma->vm_flags |= VM_CAN_NONLINEAR;
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return 0;
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}
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/*
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* We have mostly NULL's here: the current defaults are ok for
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* the nilfs filesystem.
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*/
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struct file_operations nilfs_file_operations = {
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.write = do_sync_write,
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.aio_read = generic_file_aio_read,
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.aio_write = nilfs_file_aio_write,
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.ioctl = nilfs_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = nilfs_compat_ioctl,
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#endif /* CONFIG_COMPAT */
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.mmap = nilfs_file_mmap,
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.open = generic_file_open,
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/* .release = nilfs_release_file, */
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.fsync = nilfs_sync_file,
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.splice_read = generic_file_splice_read,
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};
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struct inode_operations nilfs_file_inode_operations = {
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.truncate = nilfs_truncate,
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.setattr = nilfs_setattr,
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.permission = nilfs_permission,
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};
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/* end of file */
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